斜井中双感应测井曲线围岩校正方法

斜井中双感应测井曲线受环境因素,特别是围岩的影响较大.以电磁场理论为基础,通过对双感应测井曲线响应方法的研究,制作了不同井斜角、不同围岩电阻率情况下双感应曲线围岩校正图版.从校正图版可以看出,双感应电阻率曲线围岩校正受相对倾角、地层厚度、围岩电阻率、地层电阻率的影响.利用几何因子理论研究了不同井斜角、不同围岩电阻率情况下双感应曲线连续围岩校正方法.通过对斜井中双感应曲线的围岩影响进行校正,双感应测井曲线的纵向分辨率有所提高,其校正后的数值与Maxis500阵列感应AHT90数值接近.

On Correcting Dual Induction Logs for Shoulder Bed Effect in Deviated Borehole

The apparent resistivity measurements of dual induction logging in deviated borehole are subject to several environmental effects and in particular shoulder bed effect. Based on the theory of electromagnetic field, we studied responses of dual induction logging , and made shoulder bed effect correction charts in different hole deviation angles and different resistivity values. The correction charts show that shoulder bed effect correction values are related to relative dip angles, formation depths, adjacent bed resitivities and formation resitivities. Finally, investigated is the continuous shoulder bed effect correction method of dual induction logging. The result corrected for adjacent bed effects enhances the vertical response or resolution, and the resulting logs have values similar to high definition array induction tool (AHT 90)in Maxis500.